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I have a typical 2 wire thermostat for a wall mounted propane heater. I want to install a wifi honeywell thermostat. The thermostat is right next to the heater so running a third wire is no problem I just don't have a clue where the wire taps into the homeywell gas control valve see pics below The red and white are the 2 wires to the thermostat

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  • This might not even be a 24v system and might take more work to get a wifi thermostat working. Unless you know how to measure voltages and wire up a relay, this might not be something you can DIY.
    – JPhi1618
    Oct 19, 2021 at 19:15

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the "WHT" wire that goes from the 24V transformer to the gas valve is the C wire, tap into that.

looking at the picture of the valve it looks like the two terminals on the front of the valve (near the knob) are boith the same piece of metal, so C will be be the stripy wire on the side near the gas plumbing.

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  • It should be the wire connected to the TR (transformer) terminal on the gas valve Oct 20, 2021 at 1:56
  • yes, one of those wires, not the other one.
    – Jasen
    Oct 20, 2021 at 2:10
  • The three gas valve terminals are uniquely labeled (TR, TH, TH/TR) Oct 20, 2021 at 2:11
  • So the hardware doesn't match the wiring digram where the four terminal are tow labeled th and two tr?
    – Jasen
    Oct 20, 2021 at 2:14
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    looking at the picture of the valve it lookls like the two terminals on the front of the valve (near the knob) are both the same piece of metal, so that will be R and C will be be the stripy wire on the side near the gas plumbing.
    – Jasen
    Oct 20, 2021 at 2:20

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